CVE-2020-28220

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-11 · updated 2026-06-17
Weakness: CWE-119

Description

A CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer vulnerability exists in Modicon M258 Firmware (All versions prior to V5.0.4.11) and SoMachine/SoMachine Motion software (All versions), that could cause a buffer overflow when the length of a file transferred to the webserver is not verified.

Affected products

Schneider-Electric Modicon M258 Firmware: before 5.0.4.11 — fixed in 5.0.4.11
Schneider Electric SoMachine: all versions
Schneider-Electric Somachine Motion: all versions

How to fix

Upgrade to a fixed version: Schneider-Electric Modicon M258 Firmware 5.0.4.11. Check the vendor advisory for mitigations.

References

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